While waiting for engine parts I decided to bleed the brakes on the truck. All new calipers, pads, rotors up front and rebuilt drums in the rear. Also all the lines are new. Rears bled great with no problems with my son working the pedal and me underneath. Went to do the passenger side front and got no fluid. I cracked the line coming from the proportioning valve and it was dry. Tried blowing it out with compressed air as I figured maybe dirt was blocking the hole and nothing. I then took a needle and a mirror and pushed it up into the hole and found a lot of resistance. It finally punctured something (???) and the fluid started dripping. I reattached the line and was able to get fluid at the caliper. I would not have thought a piece of debris would cause that much resistance hence my question, what did I pierce with that needle and is that valve now fubar?